Dipper-stick control for excavating machines



Dec. 20, 1932.

c. l.. GEOGE 1,891,351

STICK CONTROL FOR EXGAVATING MACHINES F-iled March '7, 1931 DIFFER 2 SheetsfSheet 1 BY @vw/wm.

ATTO RN E YS Dec. 20, 1932. c. L. GEORGE DIFFER sTIcK CONTROL FOR EXGAVATING MACHINES Filed March 7, 1931 2 Sheets-Sheet 2 lines. 30

Patented Dec. Z0, 1932 UNITED STATES CHARLES L. GEORGE, OF FINDLAY, OHIO YIDI'JJCHIER COMPANY, A

DIFFER-STICK CONTROL F0 Application filed March 7,

ous forms, one embodiment thereof is illustrated in the accompanying drawings, in 'whichy l j Figure 1 is a side elevation of an apparatus embodying the invention, with Aone position of the dipper-stick and its dipper shown in full lines and with other positions lthereof shown in dotted lines. Fig.i2 is a perspective view of the dipper-stick and its control with parts broken away. Figs. 3 and 4 are sections on the lines 3-3 and 4 4, respectively, in Fig. 1, and Fig. 5 is a diagrammati- Vcal view `illustrating the connections of the hoist and crowd and the holding Vcables with the VYboom and dipper-stick, the boom and dipper-sticlr being partially shown in dotted Referring to the drawings,- 1 designates the vcustomary housing for the operator and operating machinery, which Vhousing is rotatably mounted ona suitable tractor means 2; The usuall boom 3 is pivoted to the forward end of the base portion'of the housing 1 forv verticalpivotal movements relative thereto and such movements are controlled by a cable 4, which extends from a control drum (not shown) within the housing 1 to andv around a sheave 5 on the forward end of the boom and thence back to a suitable anchoring point on the housing, shown in the present instance at V6. Y

The dipper-stick 7, carrying the dipper 8 at its outer end, is slidingly mounted on a guide-frame 9, and this frame is mounted on a shipper-shaft 10 carried by the boom for vertical rocking movements relative thereto. The shaft 1() is mounted on the top of the boom substantially midway of its length and vPATElvT OFFICE ASSIGNOR T0 THE BUCKEYE T11-ACTION CORPORATION OF OHIO R EXCAVATING MACHINES 1931. Serial No. 520,856.

the dipper-stick 7 crosses the boo-m from front to rear, and thelongitudinal move-V frame 9 engages to guide the longitudinal movements of the stick. As this manner of mounting the stick is old, it need not be specifically described. The control for the dipper-stick 7 comprises the crowd and hoistlv cable 11 and the holding cable 12 in cooperation with the customary or any suitable operatingmechanism therefor in the housing 1, which mechanism includesthe two drums 13 and 14 on which said cables respectively wind. It is understood in mechanisms of this character that the control drums for the cables are adapted to be independently and positively ydriven in cable-winding direction and that their unwinding movements are brake-controlled. Y Y

The crowd' and hoist cable 11 extends forwardly'from the control drum 13` around a sheave 1 5 from the under side thereof, which sheave is mounted on the shaft 10 intermediate the dipper kbeams 7a, 7, then extends rearwardly around a sheave 16 on across shaft 17 at the rear end of the dipper-stick, then forward along'the top of the dipperstick to and around a sheave 18 carried by the forward end thereof, thence upward around a sheave 19 onV the forward end of the boom 3,' thence down around the forward side of a sheave 20 mounted on the shaft21 with the sheave 18,`thence rearward along the top of the clipper-stick around a sheave 22 on the shaft 17 with the sheave 16, and thence forward along the under side of the dipper-stick to a point where it is anchored tothe guide Vframe 9, as indicated vat 23. It vis evident thata drawing in of the cable 11 effects a shortening thereof and a consequent outward crowding of the dipper-stick" the *permissible eXtent,'as hereinafter described, and also effects `a hoisting of the dipper-carrying end of the stick, or these movements of the stick may be in unison or alternate, depending on the digging conditions or the resistance offered to the respective movements of the stick.

It is apparent from the above, that the hoist and crowd cable has a single looped connection with the outer end of the boom and that each run of the cable from such connection las looped hoisting` connection with the forward end of the dipper-stick and also looped crowding connectionV with the rear end of the stick, thus providing a twopart hoisting connection between the forward end of the dipper-stick and the upper end of the boom, and a four-part crowding lconnection with the rear end of the stick.

This provides a very efficient and powerful it passes around a sheave 27 and thence back along the stick to the guide frame 9 to which 1t anchors as at 28. rI`he sheave 27 1s mounted between the beams of the dipper-stick on a shaft 29, and the sheaves 15, 16, 22 and 26 are also mounted between thedipper beams. rlhe sheaves 18 and 20, however, are mounted between side brackets 30, which rise from the forward end of the dipper-stick in transversely spaced relation and carry the shaft 21.

It is apparent that a shortening of the cable 12 will effect a rearward sliding of the dipper-stick 7 on the guide frame 9, if the cable 11 is free to pay out to permit such movement, and that when the cable 12 is held against paying-out movement, it forms a holding or anchoring means for the dipper-stick to prevent a lengthwise outward movement thereof, and will permit it to freely swing about the shaft 10 as an axis.

YWhen the crowd and hoist cable 11 is shortened or drawn in by winding action ofgits drum 13, it will first effect an outward movement of the dipper-stick to the limit permitted by the holding cable 12 and will then raise the outer end of the dipper-stick toward the upper end of the boom. This movement may be continued until stopped by the sheaves 18 and 20 on the dipper-stick striking the sheave 19 on the boom. When suchsheaves strike and the pull on the cable is continued, the stick and its dipper move substantially from the full line position to the upper dotted line position shown in Fig. 1, the sheaves 18 such contact of the sheaves and this is accomplished by extending the outer end of the brackets beyond the sheaves 18 and 20, and providing` asegmental plate 81 on the shaft with the sheave` 19, at each side thereof, in position to have peripheral stop `engagement with the outer rounded surfaces of the brackets 30. When the brackets 30 strike the segments 31, they cause the latter to swing forward and upward and to have rolling contact with the brackets.

It is apparent that I provide a control for the movements of the dipper-stick which imparts a powerful crowding and hoisting movement to the dipper-stick for excavating and load-hoisting purposes due to the number of runs of the cable backward and forward on the stick, and, so far as I am aware,

enables a more rapid and eihcient operation of the stick than is heretofore used.

I wish it understood that my invention is not limited to any specific construction, arrangement or form of the parts, asv it i's capable of numerous modifications and changes without departing from the spirit of the claims.

Having thus described my invention, what possible with the controls I claim as new and desireto secure by United States Letters Patent is: i

1'. In an apparatus of the class described, a. boom having a sheave at its outer end, a dipper-stick having a sheave at its outer end, a crowd and hoist cable for the dipper stick, coacting guard parts carried by said boom and dipper-stick to have coaction with each v other and prevent contact of said sheaves when the dipper stick is raised, one of said having a rounded outer surface, and a segmental plate pivotally carried by the outer end of the boom and adapted to coact with said guard plate to limit the raising movements of the stick relative to the boom and to have rolling coaction therewith. d

In testimony whereof I have hereunto signed my name to thisspeciication.

CHARLES L. GEORGE.

`and 20 traveling partially around the sheave 19 ordinarily in contact therewith during such movement. It is desirable to prevent roo iso 

